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Horne Engineering Ltd
IN-SERVICE TESTING
Periodic testing should be carried out to check whether or not any deterioration has occurred in the
performance of the TSV1-3.
A thermal shut-off test, as described under maintenance, above, should be carried out. If the mixed water
coming from the showerhead is at a temperature of more than 3°C above the maximum mixed water
temperature setting then the TSV1-3 is due for maintenance.
Note: A thermostatic mixing valve in need of maintenance can be undetectable in normal use and only
become apparent when disruption occurs in the hot or cold water supply temperatures or pressures.
The frequency of in-service testing depends upon the condition of the water passing through the TSV1-3. In-
service testing must be carried out more frequently in hard water areas than in soft water areas. As a general
guide, in-service testing should be carried out at intervals somewhere between six months and 12 months. In-
service testing should be carried out at least every 12 months and, where the water is hard, the interval may be
less than 6 months. Experience of local conditions and the in-service testing record will dictate the frequency of
in-service testing.
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Issue 4 June 2016
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